Shell and devein shrimp; set aside.,Stir cashews in heated oil in large frying pan till they give off a nutlike aroma and begin to brown.,Remove with a slotted spoon and reserve.,To same oil, add in onion and celery.,Cook, stirring occasionally, over medium high heat till onions are transparent, about 3 min.,Add in mushrooms and cook till they begin to brown.,Fold in garlic and shrimp, stirring till shrimp turn pink.,______,To shrimp mix, add in spinach and peas; stir 30 seconds.,Fold in cornstarch mix, stirring just till thickened.,Taste; add in salt, if needed.,Sprinkle with reserved cashews.,Serve shrimp over brown rice.